Grinding and polishing roll.



UNITED STATES PATENT QFFT CEG CLAUS A. EDLUND, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR OF ONE-HALF TO EMIL BERNSTROM, OF PROVIDENCE, RHODE ISLAND.

GRINDING AND POLISHING ROLL.

Specification of Letters Patent.

Patented Jan. '7, 1908.

dence and State of Rhode Island, has invented certain new and useful Improvements in Grinding and Polishing Rolls, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention has reference to improvements in a rotary cylinder which has secured to its surface a skin or outer covering of felt, sand paper, emery, cloth, corundum or other similar abrasive material for use in grinding or polishing.

The primary. object of this invention is to produce a practical and effective locking de vice of simple construction by which the outer grinding or polishing surface or skin may be readily attached to and detached from said roll and firmly held thereon while said roll is being operated.

My invention consists broadly of the roll being provided with an aperture through it 'set on a slight angle to its axis. Into this aperture is set a thin tubular member slotted to receive the ends of the surfacing material, said member being adapted to be rotated to carry the ends of said material into said aperture to jam or bind the same against the walls of said aperture where they are held by spring pressure.

The particular construction herein shown and described is especially designed and adapted for use on a machine for dressing or polishing wooden floors but the same device may be employed in grinding, buffing, or polishing rolls for jewelers" use or for any other purpose for which a roll of this character may be adapted.

The invention is fully set forth in this specification and more particularly pointed out in the appended claims.

In the accompanying drawings: Figure 1is a sectional elevation illustrating one of the heads in section and showing the driving mechanism whereby the speed of the roll is accelerated in rotating around their own axis by means of turning the driving gear in the opposite direction thus increasing their effective working capacity. Fig. 2- shows one of the rolls with the cut or slot therethrough made on an angle to its axis. Fig. 3is an end view of the tubular locking member. Fig. etis a side view of said locking member. Fig. 5is an end view illustrating the said locking member in position in the roll showing the ends of the surface material in position to be carried to the right and bound in the aperture by the spring lip of the tubular locking member. Fig. 6" illustrates the locking member as being turned to the right and as holding or binding the ends of an abrasive .inatcrial securely in position. Fig. 7is a perspective view iLustrating the key by which the locking tube is rotated.

Referring to the drawings at 1 is the shell or bearing, which may be fixed in any convenient way to the carriage of the machine and in this bearing is mounted the tubular shaft 2 on the lower end of which is fixed the gear 3 and to the upper end the gear 4. Passing through the center of this tubular shaft 2 is the center driving shaft 5 having the gear 6 fixed to its upper end and the block 7 secured to its lower end and by which shaft said block is rotated. In this block 7 the horizontal shaft 8 is mounted and is bound or retained in its position therein by means of the set screw 9.

The pinions 1010 are mounted one at each end of this shaft and are arranged to mesh into the gear 3, said pinions are provided with long hubs l1-11 on which the rolls 12-12 are preferably mounted.

The driving gear 13 is arranged to mesh with both the gear 4 on the tubular shaft and the gear 6 on the center shaft turning each in opposite directions whereby the center shaft carries the .rolls about a common center while the gear 3 turning by means of the tubular shaft is rotated in the opposite direction thereby rotating the rolls on their own axis at double the speed they would otherwise receive if the said gear 3 were fixed instead of rotated in the opposite direction.

The rolls used in floor finishing machines of this character may be made of any desired material but it is found to be of considerable advantage to make the same hollow and of aluminium thereby reducing the weight and the consequent wear and tear of rotating the same at a high velocity while the machine is in operation. A hole or aperture substantially round is formed from end to end through each of the rolls at 14 14 the same being set on a slight angle to the axis of said roll as illustrated in Fig. 2. These holes are preferably cut near the periphery of the roll and in such a manner that a portion of the same breaks through forming a longitudinal slot 15 in the face of the same for the reception of the ends of the thin sheets of the surfacing material to be secured to the said roll, this slot corresponding to the hole through the roll is also set on an angle to the axis so that as the roll rotates it will always present at least a portion of its surface as a bearing on the floor to back up the surfacing material and preback against the inner wall of the member,

forming eyes or pockets 20 and 21, one on each side of the openingin which to insert the operating key for turning the same in the roll. On one side of the opening 17 and fixed to the inwardly turned portion of the member is a scraping lip 19, which is adapted to closely engage the inner wall of the aperture 14. This lip is for the purpose of positively removing the ends of the surfacing material when the locking member is turned backward to release the same. The stock in this tubular member is preferably thin and springy thus rendering the engaging surface of the same competent to hold the ends of the I surfacing skin firmly by pressure.

In applying the surfacing material to the roll it is found to be of considerable advantage to first secure a layer of felt 22 or other cushioning substance to the periphery of the roll around which is wrapped a layer of polishing or abrasive faced material 23. This latter material is cut so that the same may be carried around the face of the roll so that the ends 24 and 24 of the same may be passed downward into the slot 15 in the roll. The half round portion 25 of key 26 is then inserted into the eye 20 of the locking member by which'said member is turned to the right in the direction of the arrow, thereby drawing the material closely around the face of the roll and securely binding one end against the other as shown in Fig. 6 by the pressure of the spring lip of the locking member against the inner wall of'the aperture in the roll securely holding the same by friction.

When it is desired to release the covering the key 26 is inserted into the eye 21 of the locking member and turned backward and as the lip 19 in the same closely engages and scrapes the inner wall of the aperture, it is cylinder being provided with a chamber into i which the ends of said material may extend, a slotted tubular retaining member constructed of resilient material adapted to fit closely in said chamber, said member bein adapted to bind the ends of said material against the walls of said chamber by spring pressure to hold the same by friction, and means in said member for engaging the ends of the material to eject the same as said member is turned backward to release said material.

2. A device of the character described comprising a cylinder around which is Wrapped a sheet of surfacing material, said cylinder being provided with a chamber into which the ends of said material may extend, a slotted tubular retaining member constructed of resilient material adapted to fit closely in said chamber, said member being adapted to bind the ends of said material against the walls of said chamber to hold the same by friction, said member being provided with a key receiving recess whereby the same may be rotated, and means in said member for engaging the ends of the material to eject the same as said member is turned backward to release said material.

3. A device of the character described comprising a cylinder around which is wrapped a sheet of surfacing material, said cylinder being provided with a chamber into which the ends of said material may extend, a slotted tubular retaining member constructed of resilient material adapted to fit closely in said chamber, said member being adapted to bind the ends of said material against the walls of said chamber by spring pressure to hold the same by friction, and a' scraping lip formed on one edge of said slot for engaging and removing the said material when said member is turned backward.

4. A device of the character described comprising a cylinder around which is wrapped a sheet of surfacing material, said cylinder being provided with a chamber into which the ends of said material may extend, a slotted tubular retaining member constructed of resilient material adapted to fit closely in said chamber, said member being adapted to bind the ends of said material against the walls of said chamber to hold the same by friction, said member being provided with a keyreceiving recess whereby the same may be rotated, and a scraping lip formed on one edge of said slot for engaging and removing the sandpaper when said member is turned backward.

5. A device of the character described comprising a cylinder around which is Wrapped a sheet of material, said cylinder being provided with a chamber into which the ends of said material extend, a tubular retaining member in said chamber constructed of resilient material the ends oi" the material of the retaining member being turned inward "forming pockets therein for the reception of the manipulating key, means whereby the wall of said resilient member is caused to engage and bind the ends of said material against the walls of said aperture and hold the same by friction, and means in said member for engaging the ends of the material to eject the same when said member is turned backward.

6. A device of the character described comprising a cylinder around which is wrapped a sheet of material, said cylinder being provided with an aperture into which the ends of said material extend, a tubular retaining member in said aperture constructed of resilient material the ends of the retaining member being turned inward forming pockets therein for the reception of the manipulating key and means whereby the wall of said, resilient member is caused to engage and bind the ends of said material against the walls of said aperture and hold the same by friction.

7. A device of the character described comprising a cylinder around which is wrapped a sheet of material, said cylinder being provided with a chamber into which the ends of said material extend, a tubular retaining member in said chamber constructed of resilient material the ends of the material of the retaining member being turned inward forming pockets therein for the reception oi the manipulating key, means whereby the wall of said resilient member is caused to engage and bind the ends of said material against the walls 01" said chamber and hold the same by friction, and a scraping lip formed in one edge of said slot for engaging and removing the said material when said member is turned backward.

In testimony whereof I aliix my signature in presence of two witnesses.

CLAUS A. EDLUND. \Vitnesses:

HOWARD E. BARLOW, H. O. GAMMoNs. 

